Fix CI: Install package in editable mode

.github/workflows/ci.yml

@@ -34,6 +34,7 @@ jobs:
         pip install torch --index-url https://download.pytorch.org/whl/cpu
         # Install other dependencies
         pip install -r requirements.txt --no-cache-dir
+        pip install -e .
 
     - name: Lint with Ruff
       run: |